<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <h1>{{msg.join('')}}</h1>
        <button @click="fn">逆转世界</button>
    </div>
</body>
</html>
<script src="./vue.js"></script>
<script>
    const app = new Vue({
        el:'#app',
        data:{
            msg:['H','e','l','l','o',',','W','o','r','l','d']
        },
        methods:{
            fn(){
                this.msg = this.msg.reverse()
            }
        }
    })

</script>